Nathan h



(No Model.) I

N. H. GRIFFITH.

WRENCH. Y No. 331,053. Patented Nov. 24, 1885.

: UNITED -ST TES NATHAN H. GRIFFITH, or PROVIDENCE, RHODEISLAND.

WRENCH.

SPECIFICATION forming part of Letters Patent No. 331,053, dated November24, 1885.

Application filed July 30, 1885. Serial No. 173,097. (No model.)

To all whom it may concern.-

Be it known that I, NATHAN H. GRIFFITH, of Providence, in the State ofRhode Island, have invented a new and useful Improvement in Wrenches, ofwhich the following is aspect fication.

My improvement is more especially designed as a carriage-wrench, and itmay also be advantageously employed for holding a boringbit or othertool; and it consists in the improved combination of a screw with theexpanding jaws, and also in the combination therewith of a holding-shoe, as hereinafter fully set forth.

Figure l is a side elevation of my improved wrench adapted for carriageuse. Fig. 2 is a perspective view of the expanding jaws separated fromthe body of the wrench. Fig. 3 is a detail section showing the operatingmechanism of the jaws. Fig. 4 is a detail view, partly in section,showing the jaws with their attached holding-shoes adapted to hold theshank of a boring-bit. Fig. 5 isaperspective View of the holding-shoeadapted for attachment to the jaws of the wrench. Fig. 6 is a top viewof the same. Fig. 7 is a perspective view of the same, showing thegroove adapted to receive the shank of the boring-bit.

In the accompanying drawings, A is the handle portion of the wrench,which may be either made straight, as in an ordinary monkey-wrench, orbe made in the form of a brace, as shown in Fig. 1. The handle A isprovided with a socket portion, B, within the chamber a of which isplaced the jaw mechanism, the said socket portion being provided withthe openings 1) b, adapted to receive the jaws e e, and with theperforations f f, adapted to form holding-bearings for the screw 9,which serves to operate the jaws. The socket portion B is provided atone side with a slot-opening, h, in order to secure ready access to thechamber a, for the purpose of putting the jaw mechanism together. At theupper end of the screw is secured the turning-handle t, and the lowerend of the screw is held in the perforation f by slightly spreading theextreme end of the screw or otherwise.

The jaws eeare provided with the inwardlyprojecting lug j, which is madewith a notch, k, adapted to embrace the corner of a nut, or

the square shank of a boring-bit or other tool; and by means of the lugsj, I attach to the jaws e e the shoes Z Z, provided with an angulargroove, m, (shown in Fig. 1,) which is adapted to embrace the oppositecorners of the shank of a boring-bit and to hold the same againstforcible endwise withdrawal, as shown in Fig. 4, the shoes Z Z beingprevented from moving laterally by means of the projecting ears n n.

In putting the parts together, the jaws e e are first passed upwardthrough the openings 12 b. The yoke-nut 0 is then inserted within thechamber a through the opening h and secured to the jaws by means of thejoiutscrews p. The screw 9 is then passed loosely through theperforation f at the upper end of the socket portion B and screwed intothe yoke-nut 0, after which the lower end of the screw is headed over atthe outer side of the perforation f, as shown in Fig. 3.

When used as a carriage-wrench, the nut 0, Fig. 1, will be tightly held,so that there can be no danger of dropping the same or of soiling thefingers, and the shoes Z Z, provided with the angular grooves m, areadmirably adapted for holding the shank of a boring-bit, as shown inFig. 4.

When the jaws e e are made to move outward by means of the screw,theywill be caused to separate from each other, and thus nuts of varioussizes may be operated upon by means of the same wrench, and by reason ofthe inward curving of the jaws I am enabled, with the constructionemployed, to obtain a comparatively rapid opening and closing movement;but when the parts are otherwise properly proportioned a pair ofstraight jaws may be employed.

I claim as my invention 1. The combination of the handle, the socketprovided at its outer end with holding-openings for the jaws, theoperating-screw having a bearing at the opposite ends of the socket, andthe yoke-nut with the opposite jaws held in the openings of the socketand jointed to the yoke-nut, substantially as described.

2. The combination of the handle, the socket provided withholding-openings for the jaws, the operatingscrew, and the yoke-nut withthe opposite jaws held in the openings of the socket anafijeig'itea 19'- theyfc'flie -nut; and the shoes grooved on their adjacent faces andadapted to the projecting lugs of the jaws, substantially as described;

5 3. The combination of thehandle, the socket provided at"its outei"endvvith holding open:

ings for the jaws, and with'the side opening,

h, the operating-screw having a bearing at the opposite ends of thesocket, the yoke-nut; and

the-:opigosibejaws held'in thew'pfeni-ngs of the I0 sock'et"and"join'tedto the yoke-nutyand also provided with inwardly-projecting lugs,substantially as described.

NATHAN Hp GRIFFITH.

Witnesses:

SOORATES SOHOLFIELD, J OSEPE J. SOHOLFIELD.

